ISIS leader purportedly accepts Boko Haram’s pledge of allegiance

By Hamdi Alkhshali and Steve Almasy, CNN
2 minute read
Updated 8:11 PM EDT, Thu March 12, 2015
A video of Abubakar Shekau, who claims to be the leader of the Nigerian Islamist extremist group Boko Haram, is shown in September 2013. Boko Haram is an <a href="http://www.cnn.com/2014/02/27/world/africa/nigeria-year-of-attacks">Islamist militant group waging a campaign of violence</a> in northern Nigeria. The group's ambitions range from the stricter enforcement of Sharia law to the total destruction of the Nigerian state and its government. Click through to see recent bloody incidents in this strife-torn West African nation:
A video of Abubakar Shekau, who claims to be the leader of the Nigerian Islamist extremist group Boko Haram, is shown in September 2013. Boko Haram is an Islamist militant group waging a campaign of violence in northern Nigeria. The group's ambitions range from the stricter enforcement of Sharia law to the total destruction of the Nigerian state and its government. Click through to see recent bloody incidents in this strife-torn West African nation:
Boko Haram/Getty Images
graphic warning - multiple images
Bodies lie in the streets in Maiduguri, Nigeria, after religious clashes on July 31, 2009. Boko Haram exploded onto the national scene in 2009 when <a href="http://www.cnn.com/2012/01/02/world/africa/boko-haram-nigeria/index.html">700 people were killed </a>in widespread clashes across the north between the group and the Nigerian military.
Bodies lie in the streets in Maiduguri, Nigeria, after religious clashes on July 31, 2009. Boko Haram exploded onto the national scene in 2009 when 700 people were killed in widespread clashes across the north between the group and the Nigerian military.
Aminuo Abubacar/REUTERS/Landov
An official displays burned equipment inside a prison in Bauchi, Nigeria, on September 9, 2010, after the prison was attacked by suspected members of Boko Haram two days earlier. About <a href="http://www.cnn.com/2010/WORLD/africa/09/08/nigeria.prison.break/index.html">720 inmates escaped</a> during the prison break, and police suspect the prison was attacked because it was holding 80 members of the sect.
An official displays burned equipment inside a prison in Bauchi, Nigeria, on September 9, 2010, after the prison was attacked by suspected members of Boko Haram two days earlier. About 720 inmates escaped during the prison break, and police suspect the prison was attacked because it was holding 80 members of the sect.
Sunday Alamba/AP
Nigerian President Goodluck Jonathan, second from left, stands on the back of a vehicle after being <a href="http://www.cnn.com/2011/WORLD/africa/05/29/nigeria.president.inauguration/index.html">sworn-in as President </a>during a ceremony in the capital of Abuja on May 29, 2011. In December 2011, Jonathan declared a <a href="http://www.cnn.com/2011/12/31/world/africa/nigeria-state-of-emergency/">state of emergency</a> in parts of the country afflicted by violence from Boko Haram.
Nigerian President Goodluck Jonathan, second from left, stands on the back of a vehicle after being sworn-in as President during a ceremony in the capital of Abuja on May 29, 2011. In December 2011, Jonathan declared a state of emergency in parts of the country afflicted by violence from Boko Haram.
STRINGER/EPA/LANDOV
Rescue workers help a wounded person from a U.N. building in Abuja, Nigeria, on August 26, 2011. The building was rocked by a bomb that killed at least 23 people, leaving others trapped and causing heavy damage. Boko Haram had claimed responsibility for the attack in which a Honda packed with explosives <a href="http://www.cnn.com/2011/WORLD/africa/08/31/nigeria.attack.al.qaeda/index.html">rammed into the U.N. building</a>, shattering windows and setting the place afire.
Rescue workers help a wounded person from a U.N. building in Abuja, Nigeria, on August 26, 2011. The building was rocked by a bomb that killed at least 23 people, leaving others trapped and causing heavy damage. Boko Haram had claimed responsibility for the attack in which a Honda packed with explosives rammed into the U.N. building, shattering windows and setting the place afire.
Henry Chukwuedo/AFP/Getty Images
A photo taken on November 6, 2011, shows state police headquarters burned by a series of attacks that targeted police stations, mosques and churches in Damaturu, Nigeria, on November 4, 2011. Attackers left scores injured -- <a href="http://www.cnn.com/2011/11/05/world/africa/nigeria-attacks/index.html">probably more than 100</a> -- in a three-hour rampage, and 63 people died.
A photo taken on November 6, 2011, shows state police headquarters burned by a series of attacks that targeted police stations, mosques and churches in Damaturu, Nigeria, on November 4, 2011. Attackers left scores injured -- probably more than 100 -- in a three-hour rampage, and 63 people died.
AMINU ABUBAKAR/AFP/Getty Images
Men look at the wreckage of a car after a bomb blast at St. Theresa Catholic Church outside Abuja on December 25, 2011. A string of bombs struck churches in five Nigerian cities,<a href="http://www.cnn.com/2011/12/25/world/africa/nigeria-church-bombing/index.html"> leaving dozens dead and wounded on the Christmas holiday</a>, authorities and witnesses said. Boko Haram's targets included police outposts and churches as well as places associated with "Western influence."
Men look at the wreckage of a car after a bomb blast at St. Theresa Catholic Church outside Abuja on December 25, 2011. A string of bombs struck churches in five Nigerian cities, leaving dozens dead and wounded on the Christmas holiday, authorities and witnesses said. Boko Haram's targets included police outposts and churches as well as places associated with "Western influence."
Sunday Aghaeze/AFP/Getty Images
A paramedic helps a young man as he leaves a hospital in the northern Nigerian city of Kano on January 21, 2012. A spate of bombings and shootings left more than 200 people dead in Nigeria's second-largest city. Three days later, a joint military task force in Nigeria <a href="http://www.cnn.com/2012/01/24/world/africa/nigeria-attacks/">arrested 158 suspected members</a> of Boko Haram.
A paramedic helps a young man as he leaves a hospital in the northern Nigerian city of Kano on January 21, 2012. A spate of bombings and shootings left more than 200 people dead in Nigeria's second-largest city. Three days later, a joint military task force in Nigeria arrested 158 suspected members of Boko Haram.
AMINU ABUBAKAR/AFP/Getty Images
A photo taken on June 18, 2012, shows a car vandalized after three church bombings and retaliatory attacks in northern Nigeria killed at least 50 people and injured more than 130 others, the Nigerian Red Cross Society said.
A photo taken on June 18, 2012, shows a car vandalized after three church bombings and retaliatory attacks in northern Nigeria killed at least 50 people and injured more than 130 others, the Nigerian Red Cross Society said.
Victor Ulasi/AFP/Getty Images
<a href="http://edition.cnn.com/2013/02/26/world/africa/nigeria-france-kidnapping/">A French family kidnapped</a> February 19, 2013, in northern Cameroon is <a href="http://edition.cnn.com/2013/04/19/world/africa/cameroon-french-family-released/">released after two months in captivity</a> in Nigeria. The family of four children, their parents and an uncle were kidnapped in Waza National Park in northern Cameroon, situated near the border with Nigeria. One of the captive men read a statement demanding that Nigeria and Cameroon free jailed members of Boko Haram.
A French family kidnapped February 19, 2013, in northern Cameroon is released after two months in captivity in Nigeria. The family of four children, their parents and an uncle were kidnapped in Waza National Park in northern Cameroon, situated near the border with Nigeria. One of the captive men read a statement demanding that Nigeria and Cameroon free jailed members of Boko Haram.
Maxppp/Landov
A soldier stands in front of a damaged wall and the body of a prison officer killed during an attack on a prison in the northeastern Nigerian town of Bama on May 7, 2013. Two soldiers were killed <a href="http://edition.cnn.com/2013/05/09/world/africa/nigeria-violence/index.html">during coordinated attacks on multiple targets</a>. Nigeria's military said more than 100 Boko Haram militants carried out the attack.
A soldier stands in front of a damaged wall and the body of a prison officer killed during an attack on a prison in the northeastern Nigerian town of Bama on May 7, 2013. Two soldiers were killed during coordinated attacks on multiple targets. Nigeria's military said more than 100 Boko Haram militants carried out the attack.
STRINGER/AFP/Getty Images
A deserted student hostel is shown on August 6, 2013, after gunmen<a href="http://edition.cnn.com/2013/07/07/world/africa/nigeria-school-shooting/"> stormed a school in Yobe state</a>, killing 20 students and a teacher, state media reported.
A deserted student hostel is shown on August 6, 2013, after gunmen stormed a school in Yobe state, killing 20 students and a teacher, state media reported.
AMINU ABUBAKAR/AFP/Getty Images
A photograph made available by the Nigerian army on August 13, 2013, shows improvised explosive devices, bomb-making materials and detonators seized from a Boko Haram hideout. Gunmen attacked a <a href="http://edition.cnn.com/2013/08/13/world/africa/nigeria-attacks/">mosque in Nigeria with automatic weapons</a> on August 11, 2013, killing at least 44 people.
A photograph made available by the Nigerian army on August 13, 2013, shows improvised explosive devices, bomb-making materials and detonators seized from a Boko Haram hideout. Gunmen attacked a mosque in Nigeria with automatic weapons on August 11, 2013, killing at least 44 people.
Deji Yake/EPA/LANDOV
Nigerian students from Jos Polytechnic walk on campus in Jos, Nigeria, on September 30, 2013. Under the cover of darkness, <a href="http://edition.cnn.com/2013/09/29/world/africa/nigeria-college-attack/">gunmen approached a college dormitory </a>in a rural Nigerian town and opened fire on students who were sleeping. At least 40 students died, according to the News Agency of Nigeria.
Nigerian students from Jos Polytechnic walk on campus in Jos, Nigeria, on September 30, 2013. Under the cover of darkness, gunmen approached a college dormitory in a rural Nigerian town and opened fire on students who were sleeping. At least 40 students died, according to the News Agency of Nigeria.
Ruth McDowall/EPA/LANDOV
Soldiers stand outside the 79 Composite Group Air Force base that was attacked earlier in Maiduguri on December 2, 2013.<a href="http://edition.cnn.com/2013/12/02/world/africa/boko-haram-attack/"> Hundreds of Boko Haram militants attacked</a> an Air Force base and a military checkpoint, according to government officials.
Soldiers stand outside the 79 Composite Group Air Force base that was attacked earlier in Maiduguri on December 2, 2013. Hundreds of Boko Haram militants attacked an Air Force base and a military checkpoint, according to government officials.
STRINGER/AFP/Getty Images
<a href="http://edition.cnn.com/2013/11/15/world/africa/cameroon-boko-haram-priest-kidnapping/">Catholic priest Georges Vandenbeusch</a> speaks to reporters outside Paris after his release on January 1, 2014. Vandenbeusch was snatched from his parish church in Cameroon on November 13. Boko Haram claimed responsibility for kidnapping the priest.
Catholic priest Georges Vandenbeusch speaks to reporters outside Paris after his release on January 1, 2014. Vandenbeusch was snatched from his parish church in Cameroon on November 13. Boko Haram claimed responsibility for kidnapping the priest.
ETIENNE LAURENT/EPA/LANDOV
A man receives treatment at Konduga specialist hospital after a gruesome attack on January 26, 2014. It was suspected that Boko Haram militants opened fire on a village market and <a href="http://edition.cnn.com/2014/02/12/world/africa/nigeria-unrest/">torched homes in the village of Kawuri,</a> killing at least 45 people.
A man receives treatment at Konduga specialist hospital after a gruesome attack on January 26, 2014. It was suspected that Boko Haram militants opened fire on a village market and torched homes in the village of Kawuri, killing at least 45 people.
Jossy Ola/ap
Police officers stand guard in front of the burned remains of homes and businesses in the village of Konduga on February 12, 2014. Suspected Boko Haram militants<a href="http://edition.cnn.com/2014/02/12/world/africa/nigeria-unrest/"> torched houses in the village,</a> killing at least 23 people, according to the governor of Borno state on February 11.
Police officers stand guard in front of the burned remains of homes and businesses in the village of Konduga on February 12, 2014. Suspected Boko Haram militants torched houses in the village, killing at least 23 people, according to the governor of Borno state on February 11.
STRINGER/AFP/GETTY IMAGES
Yobe state Gov. Ibrahim Gaidam, left, looks at the bodies of students inside an ambulance outside a mosque in Damaturu. At least 29 students died in an <a href="http://edition.cnn.com/2014/02/25/world/africa/nigeria-school-attack/">attack on a federal college </a>in Buni Yadi, near the capital of Yobe state, Nigeria's military said on February 26, 2014. Authorities suspect Boko Haram carried out the assault in which several buildings were also torched.
Yobe state Gov. Ibrahim Gaidam, left, looks at the bodies of students inside an ambulance outside a mosque in Damaturu. At least 29 students died in an attack on a federal college in Buni Yadi, near the capital of Yobe state, Nigeria's military said on February 26, 2014. Authorities suspect Boko Haram carried out the assault in which several buildings were also torched.
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Rescue workers try to put out a fire after a bomb exploded at the busiest roundabout near the crowded Monday Market in Maiduguri on July 1, 2014.
Rescue workers try to put out a fire after a bomb exploded at the busiest roundabout near the crowded Monday Market in Maiduguri on July 1, 2014.
STRINGER/AFP/Getty Images
Police in riot gear block a route in Abuja on October 14, 2014, during a demonstration calling on the Nigerian government to rescue schoolgirls kidnapped by Boko Haram. In April, more than <a href="http://www.cnn.com/2014/04/15/world/africa/nigeria-girls-abducted/">200 girls were abducted</a> from their boarding school in northeastern Nigeria, officials and witnesses said.
Police in riot gear block a route in Abuja on October 14, 2014, during a demonstration calling on the Nigerian government to rescue schoolgirls kidnapped by Boko Haram. In April, more than 200 girls were abducted from their boarding school in northeastern Nigeria, officials and witnesses said.
Olamikan Gbemiga/AP
Boko Haram: Nigeria's crisis

Story highlights

NEW: Spokesman encourages potential fighters to go to Africa if they cannot get to Iraq or Syria

Abu Bakr al-Baghdadi's spokesman congratulated "our jihadi brothers" in western Africa

Boko Haram's leader had extended his pledge to be an ally in an audio message last week

CNN  — 

In an audio message purportedly from an ISIS spokesman, the group announced that a pledge of allegiance from Nigerian-based Boko Haram has been accepted by ISIS leader Abu Bakr al-Baghdadi.

The 28-minute message, which cannot be independently authenticated by CNN, was posted online by ISIS supporters.

The message says that the caliphate, or Islamic State, has expanded to western Africa and congratulated “our jihadi brothers” there.

The spokesman, Abu Mohammed al Adnani, encourages people to join fighters in Africa if they cannot make it to Iraq or Syria.

BRUSSELS, BELGIUM - MARCH 22: Wounded passengers are treated following a suicide bombing at Brussels Zaventem airport on March 22, 2016 in Brussels, Belgium. Georgian journalist Ketevan Kardava, special correspondent for the Georgian Public Broadcaster, was travelling to Geneva when the attack took place, she was knocked to the floor and began to take photographs in the moments that followed. At least 31 people were killed and more than 260 injured in a twin suicide blast at Zaventem Airport and a further bomb attack at Maelbeek Metro Station. Two brothers are thought to have carried out the attacks and a manhunt is underway for a third suspect. (Photo by Ketevan Kardava/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: Wounded passengers are treated following a suicide bombing at Brussels Zaventem airport on March 22, 2016 in Brussels, Belgium. Georgian journalist Ketevan Kardava, special correspondent for the Georgian Public Broadcaster, was travelling to Geneva when the attack took place, she was knocked to the floor and began to take photographs in the moments that followed. At least 31 people were killed and more than 260 injured in a twin suicide blast at Zaventem Airport and a further bomb attack at Maelbeek Metro Station. Two brothers are thought to have carried out the attacks and a manhunt is underway for a third suspect. (Photo by Ketevan Kardava/Getty Images)
Ketevan Kardava/Getty Images
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Related gallery The ISIS terror threat

Boko Haram’s leader, Abubakar Shekau, announced in an audio message last week that the Islamist terror group was going to ally with ISIS.

Jacob Zenn, a terror expert who lives in Nigeria, told CNN on Saturday the alliance would make sense for both groups.

“Boko Haram will get legitimacy, which will help its recruiting, funding and logistics as it expands,” Zenn said. “It will also get guidance from ISIS in media warfare and propaganda. Previously Boko Haram was a sort of outcast in the global Jihadi community. Now it is perhaps ISIS’s biggest affiliate.

“ISIS gets more international legitimacy as a global caliphate.”

Increasing violence

Boko Haram, whose name translates as “Western education is sin,” has been waging a yearslong campaign of terror aimed at instituting its extreme version of Sharia law.

Boko Haram’s tactics have intensified in recent years, from battling Nigerian government soldiers to acts disproportionately affecting civilians – such as raids on villages, mass kidnappings, assassinations, market bombings and attacks on churches and unaffiliated mosques.

Much of this violence has taken place in Nigeria. But neighboring countries, such as Cameroon and Chad, have also been hit increasingly hard.

What Boko Haram’s pledge of allegiance to ISIS means

CNN’s Paul Cruickshank contributed to this report.